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Author (down) Lucia Gualtieri, Etienne Bachmann, Frederik J Simons, Jeroen Tromp doi  openurl
  Title Generation of secondary microseism Love waves: effects of bathymetry, 3-D structure and source seasonality Type Journal
  Year 2021 Publication Geophysical Journal International Abbreviated Journal  
  Volume 226 Issue 1 Pages 192-219  
  Keywords  
  Abstract Secondary microseisms are ubiquitous ambient noise vibrations due to ocean activity, dominating worldwide seismographic records at seismic periods between 3 and 10 s. Their origin is a heterogeneous distribution of pressure fluctuations along the ocean surface. In spherically symmetric earth models, no Love surface waves are generated by such a distributed surface source. We present global-scale modelling of three-component secondary microseisms using a spectral-element method, which naturally accounts for a realistic distribution of surface sources, topography and bathymetry, and 3-D heterogeneity in Earth’s crust and mantle. Seismic Love waves emerge naturally once the system reaches steady state. The ergodic origin of Love waves allows us to model the horizontal components of secondary microseisms for the first time. Love waves mostly originate from the interaction of the seismic wavefield with heterogeneous Earth structure in which the mantle plays an important role despite the short periods involved. Bathymetry beneath the source region produces weak horizontal forces that are responsible for a weak and diffuse Love wavefield. The effect of bathymetric force splitting into radial and horizontal components is overall negligible when compared to the effect of 3-D heterogeneity. However, we observe small and well-focused Love-wave arrivals at seismographic stations in Europe due to force splitting at the steepest portion of the North Atlantic Ridge and the ocean–continent boundary. The location of the sources of Love waves is seasonal at periods shorter than about 7 s, while seasonality is lost at the longer periods. Sources of Rayleigh and Love waves from the same storm may be located very far away, indicating that energy equipartitioning might not hold in the secondary microseism period band.  
  Programme 133  
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  Series Volume Series Issue Edition  
  ISSN 0956-540X ISBN Medium  
  Area Expedition Conference  
  Notes Approved yes  
  Call Number Serial 8016  
Permanent link to this record
 
 
Author (down) Lisa-Marie Mazzolo openurl 
  Title Evolution de la calotte glaciaire du Svalbard par altimétrie laser Type Master 2
  Year 2021 Publication Abbreviated Journal  
  Volume Issue Pages  
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  Abstract  
  Programme 337  
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  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Approved yes  
  Call Number Serial 8357  
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Author (down) Lemonnier C, Schull Q, Stier A, Boonstra R, Delahanty B, Lefol E, Durand L, Robin Jp, Criscuolo F, Bize P, Viblanc Va openurl 
  Title Coping with socially stressful environments in colonial seabirds: a test of adaptive phenotype programming in king penguins Type Peer-reviewed symposium
  Year 2021 Publication 17émes journées scientifiques du cnfra, 26-27 mai 202, paris, france. oral, actes du colloque. Abbreviated Journal  
  Volume Issue Pages  
  Keywords  
  Abstract Coloniality is associated with various benefits and costs for animals affecting their fitness. Breeding colonies are heterogeneous both in terms of physical and social parameters, thus, breeding territories are of different quality relative to their location within the colony. In king penguins, increased conspecific density has been correlated with increased stress level in individual birds, suggesting a cost of colonial breeding. We used a cross-fostering approach to question the relationship linking breeding location, phenotype and reproduction success. We crossfostered eggs shortly after laying within and between high-and low-density colony areas. This design allowed us to unravel the influences of early genetic and maternal effects together with rearing environments on chick growth trajectories, stress physiology and survival. We tested whether chick phenotype is determined at birth to match their early environment or if higher social density conferred an advantage for reproduction.  
  Programme 119  
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  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Approved yes  
  Call Number Serial 8105  
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Author (down) Lemonnier C, Schull Q, Stier A, Boonstra R, Delahanty B, Lefol E, Durand L, Robin J-p, Criscuolo F, Bize P &Amp; Va Viblanc openurl 
  Title Coping with socially stressful environment in colonial seabirds: a test of adaptive phenotype programming in king penguins Type Peer-reviewed symposium
  Year 2021 Publication CEPA 5, Colloque d’Ecophysiologie Animale, 5ème édition, Montpellier, 2-4 novembre 2021. Poster. Actes du colloque Abbreviated Journal  
  Volume Issue Pages  
  Keywords  
  Abstract  
  Programme 119  
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  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Approved yes  
  Call Number Serial 8337  
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Author (down) Le Moan E openurl 
  Title Utilisation de modèles mixtes pour décrire la réponse de l’oursin spatangue Abatus cordatus (Verrill, 1876), espèce endémique des Kerguelen, aux changements environnementaux Type Master 1
  Year 2021 Publication Master 1 Sciences de la Mer, Sorbonne Universités Abbreviated Journal  
  Volume Issue Pages 15 pp  
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  Abstract  
  Programme 1044  
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  Area Expedition Conference  
  Notes Approved yes  
  Call Number Serial 8069  
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Author (down) Lavrillier, A., Gabyshev S. openurl 
  Title A Siberian Indigenous Knowledge System for Understanding Climate Change Type Journal
  Year 2021 Publication Interact – stories of arctic science ii Abbreviated Journal  
  Volume II Issue Pages 18-19, 115  
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  Abstract  
  Programme 1127  
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  Area Expedition Conference  
  Notes Approved yes  
  Call Number Serial 8319  
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Author (down) Lavrillier A. isbn  openurl
  Title Le pas léger sur la Terre des peuples des neiges Type Book
  Year 2021 Publication Atlas de la terre : comment l'homme a dominé la nature ? Abbreviated Journal  
  Volume Hors-Série Issue Pages 80-81  
  Keywords  
  Abstract  
  Programme 1127  
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  Corporate Author Thesis  
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  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN 978-2368041192 Medium  
  Area Expedition Conference  
  Notes Approved yes  
  Call Number Serial 8381  
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Author (down) Laurel Kaye, Shreyas Vissapragada, Maximilian N Günther, Suzanne Aigrain, Thomas Mikal-Evans, Eric L N Jensen, Hannu Parviainen, Francisco J Pozuelos, Lyu Abe, Jack S Acton, Abdelkrim Agabi, Douglas R Alves, David R Anderson, David J Armstrong, Khalid Barkaoui, Oscar Barragán, Björn Benneke, Patricia T Boyd, Rafael Brahm, Ivan Bruni, Edward M Bryant, Matthew R Burleigh, Sarah L Casewell, David Ciardi, Ryan Cloutier, Karen A Collins, Kevin I Collins, Dennis M Conti, Ian J M Crossfield, Nicolas Crouzet, Tansu Daylan, Diana Dragomir, Georgina Dransfield, Daniel Fabrycky, Michael Fausnaugh, Gábor Fuűrész, Tianjun Gan, Samuel Gill, Michaël Gillon, Michael R Goad, Varoujan Gorjian, Michael Greklek-McKeon, Natalia Guerrero, Tristan Guillot, Emmanuël Jehin, J S Jenkins, Monika Lendl, Jacob Kamler, Stephen R Kane, John F Kielkopf, Michelle Kunimoto, Wenceslas Marie-Sainte, James McCormac, Djamel Mékarnia, Farisa Y Morales, Maximiliano Moyano, Enric Palle, Vivien Parmentier, Howard M Relles, François-Xavier Schmider, Richard P Schwarz, S Seager, Alexis M S Smith, Thiam-Guan Tan, Jake Taylor, Amaury H M J Triaud, Joseph D Twicken, Stephane Udry, J I Vines, Gavin Wang, Peter J Wheatley, Joshua N Winn doi  openurl
  Title Transit timings variations in the three-planet system: TOI-270 Type Journal
  Year 2021 Publication Monthly Notices of the Royal Astronomical Society Abbreviated Journal  
  Volume 510 Issue 4 Pages 5464-5485  
  Keywords  
  Abstract We present ground- and space-based photometric observations of TOI-270 (L231-32), a system of three transiting planets consisting of one super-Earth and two sub-Neptunes discovered by TESS around a bright (K-mag = 8.25) M3V dwarf. The planets orbit near low-order mean-motion resonances (5:3 and 2:1) and are thus expected to exhibit large transit timing variations (TTVs). Following an extensive observing campaign using eight different observatories between 2018 and 2020, we now report a clear detection of TTVs for planets c and d, with amplitudes of ∼10 min and a super-period of ∼3 yr, as well as significantly refined estimates of the radii and mean orbital periods of all three planets. Dynamical modelling of the TTVs alone puts strong constraints on the mass ratio of planets c and d and on their eccentricities. When incorporating recently published constraints from radial velocity observations, we obtain masses of $M{\mathrm{b}}=1.48\pm 0.18\, M\oplus$, $M{\mathrm{c}}=6.20\pm 0.31\, M\oplus$, and $M{\mathrm{d}}=4.20\pm 0.16\, M\oplus$ for planets b, c, and d, respectively. We also detect small but significant eccentricities for all three planets : eb = 0.0167 ± 0.0084, ec = 0.0044 ± 0.0006, and ed = 0.0066 ± 0.0020. Our findings imply an Earth-like rocky composition for the inner planet, and Earth-like cores with an additional He/H2O atmosphere for the outer two. TOI-270 is now one of the best constrained systems of small transiting planets, and it remains an excellent target for atmospheric characterization.  
  Programme 1066  
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  Corporate Author Thesis  
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  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0035-8711 ISBN Medium  
  Area Expedition Conference  
  Notes Approved yes  
  Call Number Serial 8413  
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Author (down) Lara D. Shepherd, Colin M. Miskelly, Yves Cherel, Alan J. D. Tennyson doi  openurl
  Title Genetic identification informs on the distributions of vagrant Royal (Eudyptes schlegeli) and Macaroni (Eudyptes chrysolophus) Penguins Type Journal
  Year 2021 Publication Polar Biology Abbreviated Journal  
  Volume 44 Issue 12 Pages 2299-2306  
  Keywords Antarctica Eudyptes chrysolophus Eudyptes schlegeli Genetic identification Penguin distribution Predation  
  Abstract Understanding the movements of animals that spend much of their life at sea is difficult but important for effective conservation. Determining the at-sea distributions of Macaroni (Eudyptes chrysolophus) and Royal (Eudyptes schlegeli) Penguins poses particular challenges, including their occurrence in remote locations and difficulties in species identification owing to overlap in morphological characters, particularly in immature birds. Here we use DNA sequencing to examine vagrant Macaroni and Royal Penguins from Antarctica and New Zealand in order to improve understanding of their non-breeding distributions. Our sampling included samples from living birds, museum specimens and scavenged penguin remains recovered from the stomachs of Antarctic toothfish (Dissostichus mawsoni) caught north of the Ross Sea. Mitochondrial control region (HVRI) sequences indicated that the two samples from New Zealand were likely Royal Penguins as were the scavenged penguins. Both Macaroni and Royal Penguins were detected at Terre Adélie, Antarctica, despite the nearest breeding colony of Macaroni Penguins being 4000 km away. We provide the first evidence of Royal Penguins reaching the Ross Dependency. All but one of the vagrants were immature birds, supporting suggestions that this age group is the most likely to disperse large distances from the breeding colonies. Our study demonstrates how DNA sequences can assist in identifying taxa with similar or overlapping morphologies, as well as fragmentary bird remains.  
  Programme 109  
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  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1432-2056 ISBN Medium  
  Area Expedition Conference  
  Notes Approved yes  
  Call Number Serial 8365  
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Author (down) L. Aulus-Giacosa, F. Guéraud, P. Gaudin, M. Buoro, J. C. Aymes, J. Labonne, M. Vignon doi  openurl
  Title Human influence on brown trout juvenile body size during metapopulation expansion Type Journal
  Year 2021 Publication Biology Letters Abbreviated Journal  
  Volume 17 Issue 10 Pages 20210366  
  Keywords brown trout density dependence dispersal invasion biology subantarctic  
  Abstract Change in body size can be driven by social (density) and non-social (environmental and spatial variation) factors. In expanding metapopulations, spatial sorting by means of dispersal on the expansion front can further drive the evolution of body size. However, human intervention can dramatically affect these founder effects. Using long-term monitoring of the colonization of the remote Kerguelen islands by brown trout, a facultative anadromous salmonid, we analyse body size variation in 32 naturally founded and 10 human-introduced populations over 57 years. In naturally founded populations, we find that spatial sorting promotes slow positive changes in body size on the expansion front, then that body size decreases as populations get older and local density increases. This pattern is, however, completely different in human-introduced populations, where body size remains constant or even increases as populations get older. The present findings confirm that changes in body size can be affected by metapopulation expansion, but that human influence, even in very remote environments, can fully alter this process.  
  Programme 1041  
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  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Approved yes  
  Call Number Serial 8373  
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